ENGINEERING RESEARCH PAPERS

captcha 2016 IEEE PAPER




Evaluating the Usability of Optimizing Text-based CAPTCHA Generation
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Abstract:A CAPTCHA is a test that can, automatically, tell human and computer programs apart. It is a mechanism widely used nowadays for protecting web applications, interfaces, and services from malicious users and automated spammers. Usability and robustness

CAPTCHA–Security affecting User Experience
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Abstract CAPTCHA-Completely Automated Public Turing test to tell Computers and Humans Apart-is a test with the aim to distinguish between malicious automatic software and real users in the era of Cyber security threats. Various types of CAPTCHA tests were

Secured CAPTCHA Password Verification Using Visual Cryptography
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Abstract: With the advent of internet, various online attacks has been increased and among them the most popular attack is phishing. Phishing is an attempt by an individual or a group to get personal confidential information such as passwords, credit card information from

CAPTCHA as graphical passwords
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Abstract–The test that is generated and graded by computers in order to check the users to be human is Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA). CAPTCHA can protect online and free services from bots that can access to

Captcha As Graphical Password
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Abstract-Security is an important issue to tackle. Different user authentication techniques are available for this purpose. Following is the security primitive based on hard AI problems. This technique is based on Captcha technology named Captcha as graphical passwords (

Review Paper on Improved Security Using Captcha as Graphical Password
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ABSTRACT Many security primitives are based on hard mathematical problems. Using hard AI problems for security is emerging as an exciting new paradigm, but has been underexplored. In this paper, we present a new security primitive based on hard AI

CAPTCHA System Using Click
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Abstract: CAPTCHA is Completely Automated Public Turing test to tell Computers and Humans Apart. It's become a key to prevent malicious programs to access web resources automatically. In this paper, a new type CAPTCHA system will be proposed. The proposed

Survey on CAPTCHA Applications
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Abstract CAPTCHA abbreviated as Completely Automated Public Turing test to tell Computer and Human Apart is a type of challenge-response test used to determine whether the user is human or not. CAPTCHA should be both legible for humans and strong against

Captcha and Graphical Password Schema in Online Guessing Attacks, relay attacks if combined with dual view technologiDDes
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An AI problem for security is emerging as an exciting new paradigm, but has been underexplored. In this paper, we introduce a new security primitive based on hard AI problems, namely, a novel family of graphical password systems integrating Captcha

Graphical Password Scheme: CAPTCHA
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Abstract-Today's, Many security primitives are used for secure user authentication which are mostly based on hard mathematical problems. Using hard AI problems for security is emerging as a new paradigm, but has been underexplored. Captcha as graphical

Implementation of Simple Text Based Shoulder Surfing Resistant Graphical Password using CAPTCHA and VRK
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Abstract: A Higher number of security primitives depend on hard difficulties that are reasonable just by mathematical formulation. Utilization of Difficult AI problems for security has turned into a development for another worldview of security, yet still left underexplored. In this paper,

CAPTCHA Cracker using MATLAB
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ABSTRACT There is a lot of activity over the internet. Be it, posting a comment on someone s blog or making a Gmail account or booking a ticket online. But with that also comes the problem of spamming.Completely Automated Public Turing test to tell Computers and

A Non-speech Audio CAPTCHA Based on Acoustic Event Detection and Classification
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Abstract:The completely automated public Turing test to tell computers and humans apart (CAPTCHA) represents an established method to prevent automated abuse of web services. Most websites provide an audio CAPTCHA in addition to a conventional visual scheme

A New Security Primitive Model Based on Artificial Intelligence Using Captchaas Graphical Passwords
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ABSTRACT: CaRP is both a Captcha and a graphical password scheme. CaRP addresses a number of security problems altogether, such as online guessing attacks, relay attacks, and, if combined with dual-view technologies, shoulder-surfing attacks. Notably, a CaRP

ASurvey OF CURRENT RESEARCH ON CAPTCHA
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ABSTRACT The internet has been playing an increasingly important role in our daily life, with the availability of many web services such as email and search engines. However, these are often threatened by attacks from computer programs such as bots. To address

Image And Audio Based Authentication Using Captcha As Graphical Password
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Abstract--A new security primitive based on hard AI problems. Network security is the protection of access to files and does not allow hacking by the unauthorized persons. A password consists of one click point per image for a sequence of the image adding sound.

The Influence of the CAPTCHA Types to Its Solving Times
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Abstract-In this paper, we present a survey of different CAPTCHA types. Then we address the problem of the CAPTCHA userability. In the experiment, the Internet user response to solve different types of CAPTCHA is tested. The obtained results are given and statistically

A Novel Approach for Dynamic Authentication by combining Captcha, Graphical Password and OTP in a Web Enabled System
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Abstract:Password authentication is the major issue in implementing any access control. In general, a text comprising of alphanumeric characters of a minimum length will be the password to enter into a system. When the user enters the correct sequence of characters,

A Multibiometrics-based CAPTCHA for Improved Online Security
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Abstract CAPTCHA (Completely Automated Public Turing Test to tell Computers and Humans Apart) have been a common tool for preventing unauthorized access to websites for over a decade, but increasingly sophisticated optical character recognition algorithms

A Survey on Captcha Categories
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Abstract–Authentication methods are used to tackle a very important issue, the cyber security. It helps to avoid the illegal use or misuse of highly sensitive data. Completely Automated Public Turing Test to Tell Computer and the Humans Apart (CAPTCHA) is the

A Review on CAPTCHA as Graphical Password
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Abstract CAPTCHA is a stands for completely automated public turing test to tell computers and human apart. It is a type of challenge-response test used in computing to determine whether or not the user is human. There are different type of CAPTCHAs are available

Web Application Security Approach against Online Password Guessing Attacks Using CAPTCHA
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Abstract:Brute force and Dictionary attacks are becoming an inevitable security threat to web applications today. Common measures taken to prevent online password guessing attacks include delaying server response and account locking mechanism. However these

CAPTCHA: A New Security Approach by Using Graphical Password
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Abstract:One of the most important field in our modern technology is related to protecting the information and securing it. We are going to develop a new security primitive that isCaptcha as graphical passwords. A Captcha is an acronym for Completely Automated

Efficient User Authentication using Captcha and Graphical Passwords
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Abstract: The most common computer authentication method is to use alphanumerical usernames and passwords. This method has been shown to have significant drawbacks. For example, user tends to pick passwords that can be easily guessed. On the other hand, if a

Modernization of CAPTCHA using Skin Detection Sensors: A Survey
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ABSTRACT CAPTCHA is a mechanism to protect the website from malicious programs called bots. The ability of humans to discern distorted characters and to correctly feed them into the computer distinguishes them from bots. With advent in artificial intelligence, the

Data Security Using Textual and Graphical Approach for CAPTCHA
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ABSTRACT-Computer security depends largely on passwords in order to authenticate human users. The term password commonly refers to a secret used for authentication. Passwords are the most commonly used method for identifying users in computer and

Analysing Captcha as a gRaphical Password (CaRP)
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Abstract:A typical way to enter a textual password through keyboard is not secure against various attacks. Also bots can get access of the user's account by doing the guessing attack. To overcome this drawback the graphical passwords are developed. Graphical password

CARP: CAPTCHA as A Graphical Password Based Authentication Scheme
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Abstract: This research aims to study the existing password schemes and to design and develop a new improved graphical password scheme. CaRP is Captcha as a graphical password. With the hybrid use of CAPTCHA and graphical password it can addresses a

A Comparative Study Of Graphical And Captcha Based Password Authentication Technique
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ABSTRACT User Authentication is required in the field of Information security to ensure that the individual is who he or she claims to be, but it says nothing about the access rights of the individual. Human factor is the weakest link in the Information security chain. Problem lies

The Effect of CAPTCHA on User Experience among Users with and without Learning Disabilities
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Abstract CAPTCHA is a challenge-response test implemented in many Internet Websites to distinguish between malicious automatic software (" bot") and real users. However, CAPTCHA emphasizes the gaps between accessibility and security on the Internet, as it

AUTHENTICATION SECURITY SCHEME USING HARD AI BASED GRAPHICAL PASSWORD ON CAPTCHA TECHNOLOGY
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Abstract: The most common computer authentication method is to use alphanumerical usernames and passwords. This method has been shown to have significant drawbacks. For example, user tends to pick passwords that can be easily guessed. On the other hand, if a

captcha old papers



Asirra: a CAPTCHA that exploits interest-aligned manual image categorization.
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ABSTRACT We present Asirra (Figure 1), a CAPTCHA that asks users to identify cats out of a set of 12 photographs of both cats and dogs. Asirra is easy for users; user studies indicate it can be solved by humans 99.6% of the time in under 30 seconds. Barring a major

Re: CAPTCHAs-Understanding CAPTCHA-Solving Services in an Economic Context.
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Abstract Reverse Turing tests, or CAPTCHAs, have become an ubiquitous defense used to protect open Web resources from being exploited at scale. An effective CAPTCHA resists existing mechanistic software solving, yet can be solved with high probability by a human

Captcha: Telling humans and computers apart automatically
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Page 1. 1 School of Computer Science Carnegie Mellon University CAPTCHA: Telling Humans and Computers Apart Automatically Luis von Ahn Manuel Blum Nicholas Hopper John Langford

A new graphical password scheme against spyware by using CAPTCHA.
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The security and usability problems inherent in text-based password schemes have resulted in the development of graphical password schemes as a possible alternative. However, most of the current graphical password schemes are vulnerable to spyware which is a

Persian/Arabic Baffletext CAPTCHA.
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Abstract: Nowadays, many daily human activities such as education, trade, talks, etc are done by using the Internet. In such things as registration on Internet web sites, hackers write programs to make automatic false registration that waste the resources of the web sites

Text-based CAPTCHA algorithms
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Abstract A CAPTCHA is a test that a computer can automatically administer to determine if a user is a human or a computer. Several aural and visual CAP'TCHAs have already been developed, but a completely textfbased CAPTCHA is still elusive,[n this paper 1 describe

Towards a universally usable CAPTCHA
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ABSTRACT CAPTCHAS are widely used on websites to differentiate between humans and computers. Audio CAPTCHAs provide an alternative interface that is accessible to blind users and users with low vision who are unable to see visual CAPTCHAs. We present a

A dual-use speech CAPTCHA: Aiding visually impaired web users while providing transcriptions of Audio Streams
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Abstract This work focuses on development of an alternative aural CAPTCHA technology based on a speech transcription task. The principal goals are (1) to provide a better quality of service for visually impaired web users who currently have few alternatives for

Survey of Different Types of CAPTCHA
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Automated Public Turning Test to tell Computers and Humans Apart [1]. CAPTCHA is basically used as a protection from these malicious programs like Bot. Now a day's for web security we are using different type of captcha. In this paper we describe all type of

A review of bot protection using CAPTCHA for web security
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Abstract: Today several daily activities such as communication, education, E-commerce, Entertainment and tasks are carried out by using the internet. To perform such web activities users have to register regarding the websites. In registering websites, some intruders write

Breaking the Holiday Inn priority club CAPTCHA
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Yahoo! mail uses images like that in Figure l asking users to type in letters that they see in images to make it harder for spammers to sign up for e-mail accounts. These simple puzzles are known as CAPTCHAs Gompletely Automated gublic luring tests to tell

Strong captcha guidelines v1. 2
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Abstract An introduction to developing secure CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) 1 systems. In addition to describing common weaknesses in CAPTCHA puzzles, focus is placed on the system as a whole,

Captcha-based code voting
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Abstract: Code voting provides an appropriate technology to address the secure platform problem of remote Internet voting, but it is not particularly user-friendly. In this paper, we propose the use of CAPTCHA-an acronym standing for Completely Automated Public

Move Select: 2-Layer CAPTCHA Based on Cognitive Psychology for Securing Web Services
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Abstract:Nowadays, due to enormous growth of web users many services in the internet including Email, search engine, social networking are provided with free of charge. With the expansion of Web services, denial of service (DoS) attacks by malicious automated

Ka-captcha: An opportunity for knowledge acquisition on the web
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Abstract Any Web user is a potential knowledge contributor, but it remains a challenge to make them devote their time contributing to some purpose. In order to align individual with social interests, we selected the CAPTCHA Web resource protection application to embed

Dynamic cognitive game captcha usability and detection of streaming-based farming
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Abstract:CAPTCHAs are a widely deployed mechanism to distinguish a legitimate human user from a computerized program trying to abuse online services. Attackers, however, have devised a clever and an economical way to bypass the security provided by CAPTCHAs

An Image-Based CAPTCHA Scheme Exploiting Human Appearance Characteristics.
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Abstract CAPTCHAs are automated tests that are there to avoid misuse of computing and information resources by bots. Typical text-based CAPTCHAs are proven to be vulnerable against malicious automated programs. In this paper, we present an image-based

Understanding Captcha: Text and Audio Based Captcha with its Applications
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Abstract:CAPTCHAs are short for Completely Automated Public Turing test to tell Computer and Humans Apart. The purpose of a CAPTCHA is to block form submissions from spam bots–automated scripts that harvest email addresses from publicly available web

Vote verification using captcha like primitives
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Abstract Recently proposed voter-verifiable protocols provide encrypted paper receipts to voters, who may later check that these receipts are in the electronic ballot box. This paper describes an enhancement that allows the voter to electronically transmit, from the polling

Leveraging Cognitive Factors in Securing WWW with CAPTCHA.
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Abstract Human Interactive Proofs systems using CAPTCHA help protect services on the World Wide Web (WWW) from widespread abuse by verifying that a human, not an automated program, is making a request. To authenticate a user as human, a test must be

Image-based CAPTCHA with JACI
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Implementation). JACI is an image-based CAPTCHA technology that requires users to match like images with their partner image in order to pass the test. JACI is not dependant on keyboard interaction which aids some forms of accessibility and does not require

Breaking an Image based CAPTCHA
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A CAPTCHA is" Completely Automated Public Turing test to tell Computers and Humans Apart". An image of distorted letters is dynamically generated. Since the letters are a part of an image and not text, it is difficult for a spam bot or other computer program to read. A

Non-writer specific handwriting generation for the captcha application
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Abstract Automated recognition of unconstrained handwriting continues to be a challenging research task. Unavailability of large training datasets adds to these challenges and therefore there is a special interest in generating synthetic human-like handwritten

Image captcha based authentication using visual cryptography
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ABSTRACT Anti-phishing mechanisms in the websites currently focus on helping users to verify whether a web site is genuine or not. Phishing on the web pages is an attempt by an individual or a group to threats/hackers trying to retrieve an individual's personal

A hybrid method for image taxonomy: Using captcha for collaborative knowledge acquisition
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Abstract We present a new method for image taxonomy. Our formulation shows how the combination of automated metadata-based analysis and knowledge-acquisition tools can help build better image search applications. We build on top of existing metadata-based

On Random Field CAPTCHA Generation
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Abstract. Herein, we propose generating CAPTCHAs through random field simulation and give a novel, effective and efficient algorithm to do so. Indeed, we demonstrate that sufficient information about word tests for easy human recognition is contained in the site marginal

Combocaptcha-A New Vision in CAPTCHA World
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Abstract In this paper we have introduced a new form of CAPTCHA named Combocaptcha. With the help of this Captcha a revolution is can be done in the field of image and imagination based Captcha. In this Captcha we have to identify the image which is

An Efficient user Authentication using Captcha and graphical passwords-a Survey
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Abstract: CAPTCHA is an acronym for Completely Automated Public Turning Test to tell Computers and Humans Apart. Captcha is one of the widely used techniques for preventing malicious program from accessing the web resource automatically. Now a day's for web

Reviewing effectiveness of CAPTCHA
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Abstract: The massive use of the Internet and WWW by the government and commercial organizations for automation of work has resulted in extensive proliferation of online computing. To avoid online forms being filled by bots or malicious computers the form

Shortcomings in CAPTCHA Design and Implementation: Captcha2, a Commercial Proposal.
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Abstract: Many CAPTCHA proposals have shortcomings in their design or implementation that make them much weaker than intended. In this paper we study Captcha2, a commercial algorithm, as a means of showing typical flaws that make many CAPT-CHAs prone to

Mouse intervention CAPTCHA.
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Abstract CAPTCHA (Completely Automatic Public Turing to tell Computers and Human Apart) has been developed to defend e-commerce systems from the attack of automatic scripts, spammers and bots; or to prevent worms on instant messaging (IM)[1]. In this

Novel captcha schemes
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Abstract A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a program that can generate and grade tests that most humans are able to solve, yet current computer programs are not. They are used to protect various kinds of

CAPTCHA-based DDoS Defense System of Call Centers against Zombie Smart-Phone
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Abstract Recently, some researchers alarm the security community that the smart-phone which is interoperable between telecom networks and Internet, is dangerous conduits for Internet security threats to reach the telecom network such as DDoS attacks to the

Hybrid Collage CAPTCHA
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Abstract:Authentication is indeed at the heart of any secure system. CAPTCHAs, a class of HIPs tests, are a program that tells whether user is a human or a computer. CAPTCHAs currently in use have been broken. Thus, there is a need to employ stronger CAPTCHAs

A New Approach Towards Web Security Cracking based on CAPTCHARecognition Using Mixture of Experts
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Abstract:CAPTCHA, an acronym which stand for= Completely Automated Public Turing test to tell Computers and Humans Apart ', is an automated challenge and response test to ensure that a human is making an online transaction rather than a computer. In this paper,

A survey on CAPTCHA technique based on drag and drop mouse action
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Abstract:CAPTCHA, Completely Automated Public Turning Test to tell Computers and Humans Apart, it is a one type of test. CAPTCHA is standard internet security they protect online emails and services from being abused by malicious computer program or BOT.

Evolving New CAPTCHA using LCG Algorithm and Unpredictable Algorithm
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Abstract: Completely Automated Public Turing Test to Tell Computers and Human Apart (CAPTCHA) is designed for simple problems that can be quickly solved by human, but are difficult for computers to solve [5]. It can work as a defeating CAPTCHA and make

Comprehensive Study on Performance Analysis of Various Captcha Systems
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Abstract With growing use of internet and its services, a large number of organizations are making use of password to provide security. A password is a secret word or combination of alphabet used for user authentication. Authentication to user account to access internet

From CAPTCHA TO AQ-SOCHAMACAP: A Move from Static Question to Dynamic Question
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ABSTRACT This paper proposed AQ-SOCHAMACAP which is a type of CAPTCHA that has to do with mixing alphanumeric characters and other special characters, such that the user will be asked to look at the characters provided and then answer the challenge based on it

A New Security Mechanism for Graphical Password Authentication using Combo Captcha in Video Technology
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Abstract: CAPTCHA also known as Human Interaction Proof (HIP) is a system that has become a standard security mechanism for protecting web sites from web bots by generating tests that are solvable by humans and not by computers. As in today's web

A game and accelerometer-based captcha scheme for mobile learning system
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Abstract: Most CAPTCHAs are designed to defense bots-logon to exploit, the massive spam and registration attacks. However, both text-based and imaged-based challenges which are not suitable for mobile devices. Text-based CAPTCHAs with too much noises and

3D CAPTCHA
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ABSTRACT This document describes a new type of CAPTCHA technology based on spatial perspective and human imagination. The basic idea is rotation of a special 3D model and finding the correct position of rotation. 3D model can be created from any 2D image. First,

Introducing three-tier captcha to prevent DDOS attack in Cloud computing
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Abstract:cloud computing refers to a computing hardware machine or group of computing hardware machines commonly referred as a server or servers connected through a communication network such as the Internet, an intranet, a local area network (LAN) or

Securing Web Services and Application using Captcha Security
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Abstract There are many services in the internet including Email, search engine, social networking are provided with free of cost. To access these web services users have to register regarding the websites. During registration, some intruders or attackers write

Evaluation of Captcha Technologies towards Graphical Password Scheme
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Abstract: Evaluation of Captcha technologies towards a Graphical password scheme used for User Authentication Online guessing attacks, relay attacks and shoulder surfing attacks are handled, where Captcha as graphical passwords (CaRPS) and reCAPTCHA. Wheare

Advanced Character Collage CAPTCHA
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Abstract: Text based CAPTCHA systems are widely used as a security mechanism for web access control. Considering their broad use, many attacks are challenging them every day. Most of the attacks aimed at CAPTCHAs are based on the latest computer vision

A Technique for Web Security Using Mutual Authentication and Clicking-Cropping Based Image Captcha Technology
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Abstract–The major motto of my research is to develop a technique for web security using mutual authentication and clicking and cropping based image CAPTCHA technology. In our technique, we use two sections as registration and login. To create an account to use the

Breaking Microsoft's CAPTCHA
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Abstract In this work we analyze the weaknesses of the CAPTCHA scheme used by Microsoft in their registration website. Furthermore, we propose some alternatives to mitigate the weaknesses found. In the first part of this project we built a CAPTCHA data set and

Assessing Threat Posed to Video CAPTCHA by OCR-Based Attacks
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2.1 Different parameters in video-understanding based CAPTCHA [9] affecting the pass rates of humans and the break rates frequency-based attacks. Configurations define the parameters: n=# of related tags in the groundtruth; t= threshold for frequency pruning; s=

UNDERSTANDING CAPTCHA
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In 1997, AltaVista was being victimized by the automatic submission of URLs to their add- URL service Chief Scientist Andrei Broder and his colleagues devised a way to prevent bots from submitting URLs Method was to generate random strings of text and distort

Face Captcha
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Abstract: Now a day's use of smart phone increases tremendously. User gives the priority to the touch screen mobile or tablets which is based on touch screen technology. Security level in these devices is not much as compare to the desktop computer. Today user uses the

Captcha as Graphical Passwords
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Abstract-Many security primitives are based on hard mathematical problems. Using hard AI problems for security is emerging as an exciting new paradigm, but has been underexplored. In this paper, we present a new security primitive based on hard AI

Increasing False Rejection Rate While Accepting Entries in Presence of CAPTCHA
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Abstract. With the increase in online registration process their need to enter a CAPTCHA code for security reasons. This assures the human interface with machine. If CAPTCHA is not properly entered then user is unable to submit their entries while user is authorized. in

IMPLEMENTING A NEW SECURITY PARADIGM USING CAPTCHA AND GRAPHICAL PASSWORD SCHEMA
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Abstract:The general process of the computer authentication method is used to many security protocols, in which alphabetic and numerical values for user names and passwords. The various user authentication methods are uses text passwords, but it does not provide

Improved Security Using Captcha as Graphical Password
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Abstract: Consumers tend to choose unforgettable passwords that are easy for aggressors to guess, but strong system allotted passwords are hard for users to recall. Many protection primitives are based on difficult mathematical complications. Utilizing strong AI problems

SECURING PRIMITIVE BASED GRAPHICAL PASSWORD STRATEGY AGAINST SPYWARE BY USING CAPTCHA
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ABSTRACT: Digital security is an imperative issue to handle. Different client confirmation strategies are utilized for this reason. It serves to maintain a strategic distance from abuse or unlawful utilization of exceedingly touchy information. Content and graphical passwords

Review on Captcha: Graphical Password for Security
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Abstract--The utilization of passwords is a major point of vulnerability in pc security, as passwords are typically straightforward to guess by machine-driven programs running dictionary attacks. Several security primitives are supported AI mathematical issues. Using

Application of the Technology Acceptance Model to OCR-based CAPTCHAsystems
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Abstract This research investigates the applicability of F. Davis's Technology Acceptance Model to OCR-based CAPTCHAs involved in free e-mail accounts registration process. The results provide preliminary evidence that Technology Acceptance Model may be a useful

Captcha Generation for Secure Web Services
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Abstract:A captcha is completely automated public turing test to tell computers and humans apart [1]. Almost all internet users have log in accounts for internet sites [2]. Often they come across a distorted image of pseudorandom letters and digits to enter these sites. it can be